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Picture of Concrete Farmhouse Sink
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My wife and myself are building our own home and love the classic farmhouse sink. Problem is that they’re very expensive and we want to save money wherever possible. So we started looking into how to DIY a kitchen sink yet couldn’t find much of anything so we went out on our own and now here we are making our first instructable on how we made our own concrete farmhouse kitchen sink.

Step 1: Make the Mold

Picture of Make the Mold
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On this project I used high grade 3/4” plywood for the mold. It is very helpful to use a plywood that has a smooth finish as any shapes in the wood will imprint on the concrete when it cures.

To make the mold I had five pieces cut. One for the “bottom”, two for the length sides, and two for the width sides. The dimensions I used for these are,

1 bottom piece = 3' x 1.5'

2 length side pieces = 1.5' x 6"

2 width side pieces = 3' x 6"

Next you’re simply going to screw the four sides and bottom together creating a square bucket. I used two screws for each side, one on the upper side and one on the lower. This held the concrete perfectly.

I would recommend reinforcing the sides with 2x4’s possibly as the weight of the concrete actually warped one of the long sides outward. Not a issue for me because we actually wanted a slightly curved front and had a happy accident that gave us that.

Finally put a bead of the silicone in all the corners and smooth it out with your finger. Be liberal with the silicone as this is ensuring your mold doesn’t leak.

CraftAndu15 days ago
What a great idea, thanks!
That looks great! I look forward to seeing it installed :)
Thank you. I plan on doing another instructable on the install when everything is ready.
That's great! I look forward to seeing it :)
PierreP3521 days ago
Bravo! Inspirational to see you succeeded in spite of making some mistakes (which I surely would have made).
Jacob Galliher (author)  PierreP3520 days ago
Thank you. I’m happy with it too for stumbling through the concrete section of the store.
I've always loved this style of sink! Turned out really gorgeous :)
Jacob Galliher (author)  jessyratfink20 days ago
Why thank you. My wife has always loved them too so I wanted to be able to give that to her.
dsmith26721 days ago
Nice tutorial. Are you sure you used 6" diameter holes for the sink drains? The actual holes in your sink look much smaller - like 3 3/4" to 4". Please double check this for me. Thank you.
Jacob Galliher (author)  dsmith26720 days ago
Oh my yes you are correct that was a typo. Actual diameter is 3.5” and I have corrected it. Thank you for catching that.
drcad21 days ago
Excellent work! You did a good job. And you had the right cement mix, maybe you did not vibrate the cement to eliminate all the air inclusion but their are always some patching and sanding to do after and many coats of sealer covers it all. I never thought of putting a separator in my sink.
Jacob Galliher (author)  drcad20 days ago
Not really certain. There’s a lot of cement and concrete types that I am definitely a newbie at understanding so the larger rocks that were in the mix was kinda disappointing. As far as the separator goes we went off of pictures we took of one we liked at IKEA along with measurements. Thank you for your support.
chuckyd21 days ago
I would be most cautious about using this sink for items that will contain food. To my knowledge, there is no concrete paint that is designed to withstand the conditions of the everyday kitchen sink: Hot water, various dish detergents, acids in food and drink, the impact of cast iron, aluminum, glass, and ceramic items, to be submerged in water for extended periods, and to withstand whatever else is thrown into the kitchen sink.
I suggest you contact a specialized supplier who provides the kind of protection for your kitchen sink. My first guess is a high quality epoxy supplier, such as General Polymers or Stoncote.
Jacob Galliher (author)  chuckyd20 days ago
Good suggestion I will try to find a supplier who will know and update accordingly. I figured using the same things that can handle outdoor weather and countertops would suffice and I can keep an eye on the wear when we use it over time. If it does break down or if a supplier suggest something better being DIY I can fix it no sweat. :) Thank you for the ideas and pointing out the flaws.
I love this idea! (:
seamster24 days ago
I like this, and I appreciate that you noted your mistakes. We all make lots of mistakes when we're learning new things. It's half the adventure. Can't wait to see how it looks installed! : )
Jacob Galliher (author)  seamster24 days ago
Thank you for the support. I’m excited to get it installed in the near future.